Bump maven-gpg-plugin from 3.0.1 to 3.1.0 in /json-smart (#145)

Author: dependabot[bot]

json-smart/pom.xml

@@ -99,7 +99,7 @@ limitations under the License.
 					<plugin>
 						<groupId>org.apache.maven.plugins</groupId>
 						<artifactId>maven-gpg-plugin</artifactId>
-						<version>3.0.1</version>
+						<version>3.1.0</version>
 						<executions>
 							<execution>
 								<id>sign-artifacts</id>